Product # PQ48150QGA07

Phone 1-888-567-9596

Doc.# 005-2QG415D Rev. D

8/16/02

Page 5

Performance Curves

48Vin 15Vout 6.7A

Quarter

Quarter

Brick

Brick

60

65

70

75

80

85

90

95

0.0

0.7

1.3

2.0

2.7

3.3

4.0

4.7

5.3

6.0

6.7

Load Current (A)

36 Vin

48 Vin

75 Vin

Figure 1: Efficiency at nominal output voltage vs. load current for min-

82

83

84

85

86

87

88

89

90

0

100

200

300

400

500

Air Flow (LFM)

25 C

40 C

55 C

Figure 2: Efficiency at nominal output voltage and 60% rated power vs.

(nominal input voltage).

0

2

4

6

8

10

12

14

16

0.0

0.7

1.3

2.0

2.7

3.3

4.0

4.7

5.3

6.0

6.7

Load Current (A)

36 Vin

48 Vin

75 Vin

Figure 3: Power dissipation at nominal output voltage vs. load current

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

0

100

200

300

400

500

Air Flow (LFM)

25 C

40 C

55 C

Figure 4: Power dissipation at nominal output voltage and 60% rated

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

0

2540

5570

85

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

0 LFM (0 m/s)

Figure 5: Maximum output power derating curves vs. ambient air tem-

perature for airflow rates of 0 LFM through 400 LFM with air flowing

across the converter from pin 1 to pin 3 (nominal input voltage).

Figure 6: Thermal plot of converter at 5.2 amp load current (78W) with

verter sideways from pin 1 to pin 3 (nominal input voltage).

Semiconductor junction temperature is

within 1

°C of surface temperature